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boonerwashere
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1.) A mixture of the compounds calcium chloride and aluminum sulfide contains 0.0657 mol of calcium and is 43.9 % by mass calcium chloride. The compound calcium chloride is 36.11 % by mass calcium. Calculate the mass (g) of aluminum sulfide in the mixture.
Molar Mass (g/mol)
CaCl2 110.984
Al2S3 150.159
Element Molar Mass (g/mol)
calcium 40.078
chlorine 35.453
aluminum 26.982
sulfur 32.065
2.) A 12.3 mL aqueous solution of formic acid (HCO2H) has a density of 1.20 kg/L and contains 0.279 mol of formic acid (HCO2H). Calculate the percent by mass of formic acid (HCO2H) in the solution.
Molar Mass (g/mol)
HCO2H 46.025
Molar Mass (g/mol)
CaCl2 110.984
Al2S3 150.159
Element Molar Mass (g/mol)
calcium 40.078
chlorine 35.453
aluminum 26.982
sulfur 32.065
2.) A 12.3 mL aqueous solution of formic acid (HCO2H) has a density of 1.20 kg/L and contains 0.279 mol of formic acid (HCO2H). Calculate the percent by mass of formic acid (HCO2H) in the solution.
Molar Mass (g/mol)
HCO2H 46.025